Perhaps you should try some spelling variations:
"dung mat sach snippets" » "duong mat sach snippets", "dung dat sach snippets", "dung may sach snippets", "dung mang sach snippets", "dung nam sach snippets", "dung mat sach slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung mat sach snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung mat sach snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung mat sach snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.